b'FFT Analysis of energy data shows a peak at 8 Hrs.phase, we established a bi-modal distribution (Fig. 9). By comparing the population of felts with high moisture removal after the uhle boxes ( 2500 l/Figure 10.Themin. vs those lower than 2500 l/min.), it frequency graphcan be shown that the population with of the data showsthe lower total water eliminated though discrete periodicitythe interaction among flooding showers, at 8 hrs.high pressure cleaning showers, and vacuum dewatering, also consumed Data plot during the up phase2.2% less energy. Furthermore, when the FFT software was applied to the sensor data, it became obvious where the differences were coming from (Fig. 10). The peak amplitude from the data plotted on a time domain, was at 8 hours, which coincides with shift changes. The crews had been given the freedom, in lieu of having hard data, to manipulate the showers and uhle box vacuums as they saw fit during the start-up phase of the felts life. With hard data available from the moisture sensors, felt moisture can be controlled to the levels that will minimize energy levels and thereby maximize production. This periodicity can be seen in Fig. 11. Figure 11.Moisture data from sensor shows that each shift has their own conditioning strategy. CONCLUSIONSNew moisture measuring In a series of stepwise reductions,CASE STUDY 3, ENERGY SAVINGS ANDinstrumentation is available for the vacuum was reduced until sheetWith hardPROCESS CONTROL ENHANCEMENT forming and press sections that dryness was affected.It also becamedata availableIn this study continuous measurementscan be either traversing or fixed, obvious from our measurements, thatfrom thewere taken with the 3 heads andproviding flexibility to the user. the 2nd uhle box was ineffective. moisturecompared to energy consumptionThese instruments can monitor and Through these trials, we were able tosensors, felton the machine. A chart of thesecontrol consistency in the forming redirect vacuum from the blower to themoisture canmeasurements is shown in Fig. 8.section for precise incoming or pick-up roll, and totally eliminate thebe controlledThe moisture content from the headsoutgoing moisture levels. liquid ring pump and the 2nd uhle box. to the levelswere plotted continuously along withOnboard software in these SUMMARY OF SAVINGS that willthe energy being used to dry theinstruments can perform vibration 2% of 2260 kWh blowerminimizesheet. By correlating the amount ofand pulsation analysis for predictive reduction: 45 kWh energy levelswater removed (felt water content withmaintenance and process control. 1 Liq. Ring Pump shut down: 190and therebysheet on, minus felt moisture after theSignificant energy savings and kWh maximizeuhle boxes, to the amount of energyimproved process control can Total: 1900 MWh/yearproduction. consumed during the felt start-upresult in short ROI.WORLD PULP&PAPER 73'